Cannabis is California's largest cash crop, and in the fall of 2016 the state's voters decide whether to legalize it outright, a move that could reshape US drug policy far beyond state lines. Correspondent Josh Rushing travels through the state's cannabis economy, from Humboldt County growers who built black-market fortunes to the HempCon trade show where legal dispensaries pitch themselves as mainstream business. He talks to prosecutors, judges, and campaigners on both sides, including retired judge James P. Gray and legalization advocate Tom Ammiano, and presses the odd political fact that no candidate running for statewide office will publicly back the measure. The film ties the vote to the drug war across the border in Mexico, which has killed nearly 30,000 people, and asks what changes if California stops funding that market. It also tracks the strain on the criminal justice system, where marijuana arrests have filled courts and jails for decades. The episode closes without a result, since the vote itself is still ahead, but lays out exactly what is riding on it.